When you use your credit card...
How much does it cost the merchant to process the transaction?

These first 6 digits of your credit card are called the Issuer Identification Number, or the "card bin", and they contain no personal information other than the type of card and the bank that issued the card. Furthermore, we do not store this data in any way that associates it with your request. For more information on Issuer Identification Numbers, see this Wikipedia entry.